VTP versions 1 2 3

Difference between VTP versions

VTP version 1:

Supports normal VLAN numbers (1-1001)

Supports pruning of unused VLANs (no longer sends broadcasts and unknown unicasts

supports cleartext and MD5 digest password

VTP version 2:

Forwards the VTP messages without checking the version number or domain in transparent mode

Supports Token Ring

Performs consistency check on the VTP / VLAN parameters (from CLI or SNMP)

Pass on Unrecognised TLVs

VTP version 3:

Supports extended VLAN numbers (1-4095)

Transfer information regarding Private VLAN structure

Support for databases other than VLAN (for example MST)

Protection from unintended database overrides during insertion of new switches

Hidden password protection